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Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Deferred income tax assets, Accrued expenses and reserves $ 34,167wab_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedExpensesAndReserves $ 32,243wab_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedExpensesAndReserves
Deferred income tax assets, Warranty reserve 21,123us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 16,783us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Deferred compensation/employee benefits 21,759us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 21,326us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Deferred income tax assets, Pension and postretirement obligations 26,736wab_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits 17,920wab_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensionAndPostretirementBenefits
Deferred income tax assets, Inventory 13,570us-gaap_DeferredTaxAssetsInventory 10,089us-gaap_DeferredTaxAssetsInventory
Deferred income tax assets, Net operating loss carry forwards 5,036us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 5,770us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Deferred income tax assets, Tax credit carry forwards 1,078us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 4,126us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Gross deferred income tax assets 123,469us-gaap_DeferredTaxAssetsGross 108,257us-gaap_DeferredTaxAssetsGross
Valuation allowance 1,818us-gaap_DeferredTaxAssetsValuationAllowance 3,332us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred income tax assets 121,651us-gaap_DeferredTaxAssetsNet 104,925us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities, Property, plant, and equipment 29,998us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 25,440us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred income tax liabilities, Intangibles 157,781us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 140,317us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred income tax liabilities, Other 144us-gaap_DeferredTaxLiabilitiesOther 2,045us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities 187,923us-gaap_DeferredTaxLiabilities 167,802us-gaap_DeferredTaxLiabilities
Net deferred income tax liability $ (66,272)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (62,877)us-gaap_DeferredTaxAssetsLiabilitiesNet